I have been primarily a theorist all my life and feel quite uncomfortable in having to preach the historian’s faith. Yet I have arrived at the conclusion that theoretical equipment, if uncomplemented by a thorough grounding in the history of the economic process, is worse than no theory at all.
Excerpted from a letter from Schumpeter to Miss Edna Lonegan, dated February 16, 1942, stored in the Schumpeter archives at Harvard, and reprinted in:
Swedberg, Richard. Schumpeter: A Biography. Princeton, NJ: Princeton University Press, 1991, pp. 229-230.